Transcranial Doppler Velocities

CVT vascular cerebrovascular testing

Which vessels can we see from the transtemporal view?

MCA

terminal ICA

ACA

PCA

Which vessels can we see from the transorbital view?

ICA

ophthalmic

Which vessels can we see from the transforamenal view?

vertebral

basilar

Which vessels have antegrade flow?

MCA

PCA

ophthalmic

Which vessel has bidirectional flow?

terminal ICA

Which vessels have retrograde flow?

ACA

vertebral

basilar

What direction of flow does the ICA have?

it varies depending on what segment & window is used

parasellar : antegrade flow

supraclinoid : retrograde flow

genu : both / bidirectional

At what depth do we view the MCA?

30 - 60 mm

At what depth do we view the terminal ICA?

55 - 65 mm

At what depth do we view the ACA?

60 - 80 mm

At what depth do we view the PCA?

60 - 70 mm

At what depth do we view the ICA?

60 - 80 mm

At what depth do we view the ophthalmic?

40 - 60 mm

At what depth do we view the vertebral?

60 - 90 mm

At what depth do we view the basilar?

80 - 120 mm

What velocity do we commonly see at the MCA?

55 +/- 12

What velocity do we commonly see at the terminal ICA?

55 +/- 12

What velocity do we commonly see at the ACA?

50 +/- 11

What velocity do we commonly see at the PCA?

39 +/- 10

What velocity do we commonly see at the ICA?

47 +/- 14

What velocity do we commonly see at the ophthalmic?

21 +/- 5

What velocity do we commonly see at the vertebral?

38 +/- 10

What velocity do we commonly see at the basilar?

41 +/- 10